Though this is the ZD section, I gather your not syncing as type Gmail, and instead doing an import/export in ZCS or ZD preferences. Can you clarify which (ZD or ZCS) your running? Directions for finding ZCS version are here http://www.zimbra.com/forums/announc...html#post62754

The idea is to normally use export in 'Google CSV' import in Gmail style. You can usually fall back to Google's 'Outlook CSV' format for export, however that also had problems because Google treats their name field different:

The outlook issue was caused by not having the "Name" field mapping. Outlook encourages separate 1st/mid/last names but Google only outputs the single string field